M.Sc. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
Botany
Paper IV PLANT PHYSIOLOGY
2 21124 A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any SIX of the following short notes questions.
6 30 Marks)
1. Mechanism of water uptake.
2. Stomatal index.
3. C3-C4 intemediates.
4. TCA cycle.
5. Abscissic acid.
6. Vernalization.
7. Water stress.
8. Stress tolerance mechanisms.
SECTION — B
Answer any FOUR of the following essay questions.
10 40 Marks)
9. Describe the thermodynamic concept of plant cell.
Or
Explain the role of antitranspirants in drought resistance.
10. Write an essay on photophosphorylation.
Or
Describe electron transport and ATP synthesis.

11. Describe the physiological effects and mechanism of action of gibberellins.
Or
Describe the structure and functions of phytochrome.
12. Give an account of biochemical and molecular responses of plants to
environmental stress.
Or
How do you reclamate saline and heavy metal contaminated soils?
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